CN101369843B - Ascending control signaling transmission method and base station of TDD-OFDMA system - Google Patents
Ascending control signaling transmission method and base station of TDD-OFDMA system Download PDFInfo
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Abstract
The invention discloses a method for transmitting an up control signaling of a TDD-OFDMA system to solve the problems that the system complexity is high in the actual frequency hopping realization because the pre and post two parts of the hopping frequency do not have symmetry during the transmission of the up control signaling in an LTE system. The method comprises the following steps: a base station receives the up control signaling transmitted by a user equipment on a reservation band of an up business time slot, the up control signaling is mapped to a corresponding hopping frequency, when the up business time slot is composed of nine OFDM symbols, the pre part and the post part of the hopping frequency are respectively composed of four OFDM symbols; the base station treats according to the up control signaling. For the prior LTE system, when a CP is short, the treatment complex of the hopping frequency realization is reduced by using the symmetrical hopping frequency technical scheme.
Description
Technical field
The invention belongs to the mobile communication technology field, particularly a kind of TDD-OFDMA (TDD, TimeDivision Duplex, time division duplex; OFDMA, Orthogonal Frequency DivisionMultiplexing Access, orthogonal frequency division multiplexing multiple access inserts) method and the base station of system ascending control signaling transmission.
Background technology
3-G (Generation Three mobile communication system) (3G) adopts CDMA (code division multiplexingaccess, code division multiple access) mode, supports multimedia service, in several years of future, can have higher competitiveness.But in order to ensure in the longer time, keeping this competitiveness, 3GPP has started Long Term Evolution (Long Term Evolution, the LTE) research project of 3G wireless interface technology.
For the LTE system; UE (User Equipment; Subscriber equipment) according to network indication or in advance the rule of agreement obtain the upstream control signaling of corresponding uplink service time slot; Upstream control signaling comprises CQI (Channel Quality Indicator, channel quality indication), ACK/NACK (answer signal) signaling or PMI (Precoding Matrix Index, pre-coding matrix information) etc. or its combination in any.
When not having upstream data service, upstream control signaling sends at the appointed reservation frequency band of this UE.Control channel design when not having upstream data is a upstream control signaling transmission plan key for design.In order not destroy the single-carrier property of uplink; Guarantee uplink control signaling transmission controllability simultaneously; An ascending control channel transmission plan sketch map is as shown in Figure 1; Reserve the both sides that frequency band is distributed in system bandwidth, a control channel resource (control channel resoure) is defined as a frequency hop sequences.Like this, when not having upstream data service, the upstream control signaling transmission both can utilize frequency diversity, improved transmission quality, can not destroy single-carrier property again, guaranteed that uplink has lower peak-to-average force ratio.
If the upstream control signaling of certain UE is being reserved the frequency band transmission, UE need be according to the selected transmission means of the various combination of upstream control signaling content, for example; Only have the ACK signaling, then UE does corresponding processing (modulation, coding to the ACK signaling; Multiplexing; For example adopt CAZAC sequence spread spectrum scheme), and upstream control signaling is mapped to corresponding frequency hop sequences (being the control channel resource, control channelresoure) gets on.If have ACK signaling and CQI signaling, then UE is according to the design agreement, with ACK and CQI multiplexing transmission.
After base station end is received the ascending time slot data, read corresponding upstream control signaling data (base station is to know that every UE uploads situation).Corresponding processing is made according to the upstream control signaling content in the base station, for example judges whether the needs data retransmission according to the ACK signaling, confirms transformat of downlink transmission data or the like according to the CQI signaling.
The LTE system supports second type of (type 2) frame assumption diagram, and is as shown in Figure 2, is only applicable to the TDD system.The wireless frame segmentation of a 10ms of Type II frame structure is the field (half-frame) of two 5ms, and each field comprises 7 uplink service time slots (#0 among Fig. 2～#6).Time slot also can be referred to as subframe (sub-frame).The TTI length of LTE TDD is the length of a business time-slot, i.e. 0.675ms.Each uplink service time slot is made up of the OFDM symbol, is example with #0 uplink service time slot, and the uplink service structure of time slot is as shown in Figure 3.Wherein, corresponding to short CP (cyclic prefix, Cyclic Prefix) configuration, each uplink service time slot is made up of 9 OFDM symbols (0-8 among Fig. 3).
Second type of frame knot of LTE system support, a sub-frame only is made up of a time slot, if adopt frequency hopping to realize ascending control channel, must split into 2 sections to the uplink service time slot.When weak point CP; Each uplink service time slot is made up of 9 OFDM symbols; In the LTE RAN149#bis meeting on July 25th, 2007; Disclosed first half is formed the latter half of frequency hop sequences scheme of being made up of 5 OFDM symbols (i.e. 4/5 frequency hopping) by 4 OFDM symbols, and because of two parts before and after this scheme frequency hop sequences do not have symmetry, processing complexity is high in the frequency hopping of reality realizes.Simultaneously, for guaranteeing the symmetry of frequency hop sequences, another program has been proposed: always adopt long CP structure, 4/4 frequency hopping.A shortcoming of this scheme is the situation that possibly have length CP coexistence, can realize bringing difficulty to system.
Summary of the invention
When transmitting in order to solve existing LTE system ascending control signaling; Possibly adopt long CP or short CP; When adopting weak point CP, because of two parts before and after the frequency hop sequences do not have symmetry, the high problem of processing complexity in the frequency hopping of reality realizes; The embodiment of the invention provides a kind of method of TDD-OFDMA system ascending control signaling transmission, comprising:
The base station receives the upstream control signaling that subscriber equipment transmits on the reservation frequency band of uplink service time slot; Said upstream control signaling is mapped on the corresponding frequency hop sequences; When said uplink service time slot is made up of 9 OFDM symbols, the first half of said frequency hop sequences and latter half of each form by 4 OFDM symbols;
Handle it according to said upstream control signaling in the base station.
The embodiment of the invention also provides a kind of base station of TDD-OFDMA system ascending control signaling transmission simultaneously, comprising:
Upstream control signaling receiver module: be used to receive the upstream control signaling that subscriber equipment transmits on the reservation frequency band of uplink service time slot; Said upstream control signaling is mapped on the corresponding frequency hop sequences; When said uplink service time slot is made up of 9 OFDM symbols, the first half of said frequency hop sequences and latter half of each form by 4 OFDM symbols;
Upstream control signaling processing module: be used for handling it according to said upstream control signaling.
Specific embodiments by the invention described above provides can be found out; During for the existing short-and-medium CP of LTE system, the scheme of 4/5 frequency hopping in the prior art is at transmitting terminal; After the ack signal of a UE added pilot tone; Carry out the spread processing of time-frequency domain, obtain one 12 * 4 data block, be mapped to a section of frequency hopping.For another section, also to pass through a same spread processing process, obtain one 12 * 5 data block.
Receiving terminal, two sections receive signals and can not directly merge because data do not have corresponding relation, need carry out channel estimating and despreading respectively after, could merge processing and obtain testing result.
And adopt the embodiment of the invention that the scheme of 4/4 frequency hopping is provided, at transmitting terminal, the ack signal of a UE added pilot tone after, carry out the spread processing of time-frequency domain, obtain one 12 * 4 data block, be mapped to a section of frequency hopping.For another section, directly the data that produce to be carried out the conjugation processing and get final product, the complexity of the processing of conjugation almost can be ignored.Total complexity is almost 1/2 of 4/5 frequency hopping.
Receiving terminal, two sections reception signals can directly merge, and carry out processing such as channel estimating and despreading and obtain testing result.Complexity has also reduced nearly 1 times.
It is thus clear that; Adopt first half and latter half of each technical scheme of forming by 4 OFDM symbols of frequency hop sequences just because of the embodiment of the invention; Make frequency hop sequences front and back two parts have symmetry, reduced processing complexity in the frequency hopping realization, hardware implementation cost is reduced.
Description of drawings
Fig. 1 is a prior art ascending control channel transmission plan sketch map;
Fig. 2 is that prior art LTE system supports second type of (type 2) frame assumption diagram;
Fig. 3 is prior art uplink service structure of time slot figure;
The method flow diagram that Fig. 4 provides for first embodiment of the invention;
The frequency hop sequences uplink service structure of time slot figure of the employing 4/4 that Fig. 5 provides for the embodiment of the invention;
The frequency hop sequences uplink service structure of time slot figure of the employing 4/4 that Fig. 6 provides for the embodiment of the invention;
1 OFDM symbol that Fig. 7 provides for the embodiment of the invention is pilot tone uplink service structure of time slot figure;
2 OFDM symbols that Fig. 8 provides for the embodiment of the invention are pilot tone uplink service structure of time slot figure;
2 pilot tones that Fig. 9 provides for the embodiment of the invention have the uplink service structure of time slot figure of SRS signal;
1 pilot tone that Figure 10 provides for the embodiment of the invention has the uplink service structure of time slot figure of SRS signal;
The architecture of base station figure that Figure 11 provides for second embodiment of the invention.
Embodiment
When existing LTE system ascending control signaling transmits, because there is length CP coexistence phenomenon, when weak point CP; Adopt the scheme of 4/5 frequency hopping; At transmitting terminal, the ack signal of a UE added pilot tone after, carry out the spread processing of time-frequency domain; Obtain one 12 * 4 data block, be mapped to a section of frequency hopping.For another section, also to pass through a same spread processing process, obtain one 12 * 5 data block.
Receiving terminal, two sections receive signals and can not directly merge because data do not have corresponding relation, need carry out channel estimating and despreading respectively after, could merge processing and obtain testing result.
It is thus clear that the scheme of available technology adopting 4/5 frequency hopping because two parts do not have symmetry before and after the frequency hop sequences, need be carried out twice spread processing, channel estimating and despreading and handle.Implement complicacy, hardware cost is high.
First embodiment provided by the invention is a kind of method of TDD-OFDMA system ascending control signaling transmission, and the method flow of this first embodiment is as shown in Figure 4, comprising:
Step 101: receive the upstream control signaling that subscriber equipment transmits on the reservation frequency band of uplink service time slot; This upstream control signaling is mapped on the corresponding frequency hop sequences; When this uplink service time slot is made up of 9 OFDM symbols, the first half of frequency hop sequences and latter half of each form by 4 OFDM symbols.
The upstream control signaling that UE indicates according to network or the rule of agreement obtains corresponding uplink service time slot in advance, upstream control signaling comprises CQI, ACK/NACK (answer signal) signaling or PMI etc. or its combination in any.When not having upstream data service, upstream control signaling sends at the appointed reservation frequency band of this UE.Reserving the frequency band transmission when the control signaling of UE, UE need be according to the selected transmission means of the various combination of upstream control signaling content, for example; Only have the ACK signaling, then UE does corresponding processing (modulation, coding to the ACK signaling; Multiplexing; For example adopt CAZAC sequence spread spectrum scheme), and upstream control signaling is mapped to corresponding frequency hop sequences (being the control channel resource, control channel resoure) gets on.If have ACK signaling and CQI signaling, then UE is according to the design agreement, with ACK and CQI multiplexing transmission.
When weak point CP, the uplink service time slot is made up of 9 OFDM symbols, adopts 4/4 frequency hop sequences; Be preferred scheme; Figure is as shown in Figure 5 for the uplink service structure of time slot, the first half of frequency hop sequences and latter half of each forms by 4 OFDM symbols, be labeled as a frequency hop sequences of OFDM symbol composition of " 1 " among Fig. 5; Promptly one " control channel resource ", #1 representes that this OFDM symbol is the 1st an OFDM symbol.The OFDM symbol that is labeled as " 2 " is formed another frequency hop sequences, i.e. another " control channel resource ".As another preferred scheme, figure is as shown in Figure 6 for the uplink service structure of time slot, and last OFDM symbol is idle, reserves for other use.
After adopting the embodiment of the invention that the scheme of 4/4 frequency hopping is provided, at transmitting terminal, the ack signal of a UE added pilot tone after, carry out the spread processing of time-frequency domain, obtain one 12 * 4 data block, be mapped to a section of frequency hopping.For another section, directly the data that produce to be carried out the conjugation processing and get final product, the complexity of the processing of conjugation almost can be ignored.Total complexity is almost 1/2 of prior art.
Receiving terminal, two sections reception signals can directly merge, and carry out processing such as channel estimating and despreading and obtain testing result.Complexity has also reduced by 1 times.
It is thus clear that after the technical scheme that the employing present embodiment provides, reduced processing complexity in the frequency hopping realization, hardware implementation cost is reduced.
For above-mentioned structure of time slot and frequency hop sequences scheme, different upstream control signaling pilot design can be arranged as required.For example, it is RS (Reference Signal, reference signal) as pilot tone that the low-speed applications situation adopts 1 OFDM symbol, and high-speed applications, adopting 2 OFDM symbols to do the performance of pilot tone can be better.The particular location of pilot tone OFDM symbol can require concrete the selection according to transmission plan characteristics and business etc.
This part has provided the part exemplary embodiments, but is not limited to this, and pilot tone also can be in other positions.
According to the transmission technology of application scenarios and employing, can adopt 1 OFDM symbol to do pilot tone, uplink service structure of time slot such as Fig. 7, wherein " OFDM symbol 1 " represented the 1st OFDM symbol, other is similar.As preferred scheme, first half adopts the 2nd OFDM symbol to do pilot tone, and the 7th OFDM symbol of latter half of employing done pilot tone, other OFDM symbol transmission ACK signaling.Perhaps, first half adopts the 3rd OFDM symbol to do pilot tone, and the 6th OFDM symbol of latter half of employing done pilot tone, other OFDM symbol transmission ACK signaling.
Adopt 2 OFDM symbols to do pilot tone, the uplink service structure of time slot is as shown in Figure 8.As preferred scheme, first half adopt the 2nd and the 3 two OFDM symbol do pilot tone, latter half of employing the 6th and the 7 two OFDM symbol are done pilot tone, other OFDM symbol transmission CQI or CQI+ACK signaling.Perhaps, first half adopt the 1st and the 4 two OFDM symbol do pilot tone, latter half of employing the 5th and the 8 two OFDM symbol are done pilot tone, other OFDM symbol transmission CQI or CQI+ACK signaling.
Step 102:, make corresponding processing according to upstream control signaling.After base station end is received the ascending time slot data, read corresponding control signaling data (base station is to know that every UE uploads situation).Corresponding processing is made according to the upstream control signaling content in the base station, for example judges whether the needs data retransmission according to ACK, confirms transformat of downlink transmission data or the like according to CQI.
UE need send SRS (Sounding Reference Signal, measuring reference signals) to measure the transmission quality of up channel to the base station frequently.For PUCCH, mainly transmit two types of signaling: CQI and ACK.For the CQI signaling, can make each UE can not send CQI signal and SRS signal simultaneously through controls such as scheduling, just there is not the situation of conflict in the two like this.For the ACK signaling because the ACK signaling will and descending packet between keep fixing mapping relations, therefore; The transmission subframe position of ACK can not arbitrarily change; Like this, ACK signaling and SRS send possibly simultaneously, as can not in design, guaranteeing; Destroy up single-carrier property possibly, systematic function is descended.
For second type of frame of FS2; During weak point CP, can adopt the scheme of 4/4 frequency hopping, PUCCH (the Physical Uplink Control CHannel when passing ACK; Physical Uplink Control Channel) an OFDM symbol is idle, and (9 OFDM symbols have 8 to be mapped on the frequency hop sequences; Be used for transferring ACK and 4 RS (latter half of each 2 of first half), a remaining free time), be used for transmitting SRS.As shown in Figure 9, certain UE sends ACK control signaling and RS on certain frequency hop sequences, sends SRS in the moment of idle OFDM symbol, and idle OFDM symbol can be the 5th of 9 OFDM symbol, the 8th or wherein any one.
For second type of frame of FS2; During weak point CP; Can adopt the scheme of 4/4 frequency hopping, the OFDM symbol of the PUCCH when transmission CQI or CQI+ACK signaling is idle, and (9 OFDM symbols have 8 to be mapped on the frequency hop sequences, are used to transmit CQI+ACK, CQI signaling and 2 RS (latter half of each 1 of first half); A remaining free time), be used for transmitting SRS.Shown in figure 10, certain UE sends CQI or CQI+ACK signaling and RS on certain frequency hop sequences, sends SRS in moment of idle OFDM symbol, and idle OFDM symbol can be the 5th of 9 OFDM symbol, the 8th or wherein any one.
After the scheme that the employing present embodiment provides, SRS can not destroy up single-carrier property in any position of frequency domain, makes systematic function get a promotion.
Second embodiment provided by the invention is a kind of base station of TDD-OFDMA system ascending control signaling transmission, and its structure is shown in figure 11, comprising:
Upstream control signaling receiver module 201: be used to receive the upstream control signaling that subscriber equipment transmits on the reservation frequency band of uplink service time slot; Said upstream control signaling is mapped on the corresponding frequency hop sequences; When said uplink service time slot is made up of 9 OFDM symbols, the first half of said frequency hop sequences and latter half of each form by 4 OFDM symbols.
Upstream control signaling processing module 202: be used for handling it according to upstream control signaling.
Further, said frequency hop sequences is formed or is formed by preceding 4 and back 4 in 9 OFDM symbols by preceding 8 in 9 OFDM symbols.
Wherein idle OFDM symbol is used for the transmitting SRS signal.
Wherein said upstream control signaling is CQI signaling or CQI signaling and ACK signaling, frequency hop sequences first half and latter half ofly respectively adopt an OFDM symbol to do pilot tone.
Specifically can be that first half adopts the 2nd OFDM symbol to do pilot tone, the 7th OFDM symbol of latter half of employing be done pilot tone.
Also can be that first half adopts the 3rd OFDM symbol to do pilot tone, the 6th OFDM symbol of latter half of employing be done pilot tone.
Wherein said upstream control signaling is the ACK signaling, frequency hop sequences first half and latter half ofly respectively adopt two OFDM symbols to do pilot tone.
Specifically can be first half adopt the 2nd and the 3 two OFDM symbol do pilot tone, latter half of employing the 6th and the 7 two OFDM symbol are done pilot tone.
Also can be first half adopt the 1st and the 4 two OFDM symbol do pilot tone, latter half of employing the 5th and the 8 two OFDM symbol are done pilot tone.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (24)
1. the method for a TDD-OFDMA system ascending control signaling transmission is characterized in that, comprising:
The base station receives the upstream control signaling that subscriber equipment transmits on the reservation frequency band of uplink service time slot; Said upstream control signaling is mapped on the corresponding frequency hop sequences; Said uplink service time slot is made up of 9 OFDM symbols, the first half of said frequency hop sequences and latter half of each form by 4 OFDM symbols;
Handle it according to said upstream control signaling in the base station.
2. the method for claim 1 is characterized in that, said frequency hop sequences is formed by preceding 8 in 9 OFDM symbols.
3. the method for claim 1 is characterized in that, said frequency hop sequences is formed by preceding 4 and back 4 in 9 OFDM symbols.
4. like any described method of claim of claim 1 to 3, it is characterized in that idle OFDM symbol is used for transmission measurement reference signal SRS.
5. like claim 1 or 3 described methods; It is characterized in that; When said upstream control signaling is CQI signaling or CQI signaling and ACK signaling; Said CQI signaling or CQI signaling and ACK signaling are mapped on the corresponding frequency hop sequences frequency hop sequences first half and latter half ofly respectively adopt an OFDM symbol to do pilot tone.
6. method as claimed in claim 2; It is characterized in that; When said upstream control signaling is CQI signaling or CQI signaling and ACK signaling; Said CQI signaling or CQI signaling and ACK signaling are mapped on the corresponding frequency hop sequences frequency hop sequences first half and latter half ofly respectively adopt an OFDM symbol to do pilot tone.
7. method as claimed in claim 6 is characterized in that, first half adopts the 2nd OFDM symbol to do pilot tone, and the 7th OFDM symbol of latter half of employing done pilot tone.
8. method as claimed in claim 6 is characterized in that, first half adopts the 3rd OFDM symbol to do pilot tone, and the 6th OFDM symbol of latter half of employing done pilot tone.
9. like claim 1 or 3 described methods, it is characterized in that, when said upstream control signaling is the ACK signaling, said ACK signaling is mapped on the corresponding frequency hop sequences, frequency hop sequences first half and latter half ofly respectively adopt two OFDM symbols to do pilot tone.
10. method as claimed in claim 2 is characterized in that, when said upstream control signaling is the ACK signaling, said ACK signaling is mapped on the corresponding frequency hop sequences frequency hop sequences first half and latter half ofly respectively adopt two OFDM symbols to do pilot tone.
11. method as claimed in claim 10 is characterized in that, first half adopt the 2nd and the 3 two OFDM symbol do pilot tone, latter half of employing the 6th and the 7 two OFDM symbol are done pilot tone.
12. method as claimed in claim 10 is characterized in that, first half adopt the 1st and the 4 two OFDM symbol do pilot tone, latter half of employing the 5th and the 8 two OFDM symbol are done pilot tone.
13. the base station of a TDD-OFDMA system ascending control signaling transmission is characterized in that, comprising:
Upstream control signaling receiver module: be used to receive the upstream control signaling that subscriber equipment transmits on the reservation frequency band of uplink service time slot; Said upstream control signaling is mapped on the corresponding frequency hop sequences; When said uplink service time slot is made up of 9 OFDM symbols, the first half of said frequency hop sequences and latter half of each form by 4 OFDM symbols;
Upstream control signaling processing module: be used for handling it according to said upstream control signaling.
14. base station as claimed in claim 13 is characterized in that, said frequency hop sequences is formed by preceding 8 in 9 OFDM symbols.
15. base station as claimed in claim 13 is characterized in that, said frequency hop sequences is formed by preceding 4 and back 4 in 9 OFDM symbols.
16., it is characterized in that idle OFDM symbol is used for transmission measurement reference signal SRS like any described base station of claim of claim 13 to 15.
17., it is characterized in that said upstream control signaling is CQI signaling or CQI signaling and ACK signaling like claim 13 or 15 described base stations, frequency hop sequences first half and latter half ofly respectively adopt an OFDM symbol to do pilot tone.
18. base station as claimed in claim 14 is characterized in that, said upstream control signaling is CQI signaling or CQI signaling and ACK signaling, frequency hop sequences first half and latter half ofly respectively adopt an OFDM symbol to do pilot tone.
19. base station as claimed in claim 18 is characterized in that, first half adopts the 2nd OFDM symbol to do pilot tone, and the 7th OFDM symbol of latter half of employing done pilot tone.
20. base station as claimed in claim 18 is characterized in that, first half adopts the 3rd OFDM symbol to do pilot tone, and the 6th OFDM symbol of latter half of employing done pilot tone.
21., it is characterized in that said upstream control signaling is the ACK signaling like claim 13 or 15 described base stations, frequency hop sequences first half and latter half ofly respectively adopt two OFDM symbols to do pilot tone.
22. base station as claimed in claim 14 is characterized in that, said upstream control signaling is the ACK signaling, frequency hop sequences first half and latter half ofly respectively adopt two OFDM symbols to do pilot tone.
23. base station as claimed in claim 22 is characterized in that, said frequency hop sequences is formed by preceding 8 in 9 OFDM symbols, first half adopt the 2nd and the 3 two OFDM symbol do pilot tone, latter half of employing the 6th and the 7 two OFDM symbol are done pilot tone.
24. base station as claimed in claim 22 is characterized in that, said frequency hop sequences is formed by preceding 8 in 9 OFDM symbols, first half adopt the 1st and the 4 two OFDM symbol do pilot tone, latter half of employing the 5th and the 8 two OFDM symbol are done pilot tone.
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| CN101510868A (en) * | 2009-03-17 | 2009-08-19 | 中兴通讯股份有限公司 | Method for mapping reference signal and physical resource block |
| ES2544436T3 (en) | 2009-03-19 | 2015-08-31 | Nec Corporation | Improved channel quality indicator method |
| CN103580822B (en) * | 2012-07-26 | 2018-06-19 | 中兴通讯股份有限公司 | A kind of data transmission method and system |
| CN109587794B (en) * | 2017-09-29 | 2023-05-26 | 北京紫光展锐通信技术有限公司 | Method and device for realizing PUCCH frequency hopping and user equipment |
| US20240313822A1 (en) * | 2021-07-08 | 2024-09-19 | Beijing Xiaomi Mobile Software Co., Ltd. | Frequency hopping method and apparatus, and user equipment, base station and storage medium |
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210528 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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